High-hardness ethylene propylene rubber insulation for electric submersible pump cable

Abstract

The invention provides a high-hardness ethylene propylene rubber insulator for an electric submersible pump cable. The formula comprises the following components in parts by weight: 100 parts of ethylene propylene diene monomer, 2 parts of an anti-aging agent RD, 2 parts of an anti-aging agent 1010, 5 parts of zinc oxide, 5 parts of semi-reinforcing carbon black, 2 parts of a silane coupling agent A172, 5 parts of white carbon black, 5 parts of polybutadiene, 10 parts of paraffin oil, 20 parts of calcined clay, 10 parts of talcum powder and 4 parts of DCP. The preparation process comprises the steps of plastifying, mixing, forming and vulcanizing. By modifying the formula and optimizing the process, the electrical and mechanical properties and aging resistance of the material are remarkably improved, the processability is improved, the stripping performance with a semi-conductive layer is particularly enhanced, the manufacturing cost is reduced, and good economic benefits and application prospects are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of insulating materials, in particular to a high-hardness ethylene-propylene rubber insulation for a submersible electric pump cable. Background Art

[0002] Submersible pump cable is a power cable used in conjunction with submersible pump units. This product is installed, laid and used in oil wells. The lower end is connected to the submersible motor through the submersible pump lead cable (small flat cable), and the upper end is connected to the ground control cabinet.

[0003] As the difficulty of oilfield drainage and production has generally increased in recent years, the number of horizontal wells and highly deviated wells has continued to increase, and the working environment of cables has become more complex and the working conditions have become more severe. During the construction of horizontal wells and highly deviated wells, the risk of cables scratching and colliding with the well wall has also increased due to the influence of the well inclination angle.

[0004] In the past, the EPDM rubber insulation layer used in submersible pump cables had a relatively low hardness and was easily damaged by mechanical means during construction. During the power transmission process, the insulation layer had a large leakage current, resulting in a large amount of power loss. This affected the one-time success rate of the complete oil production system and the electrical performance of the cable, thereby reducing the service life and product performance of the cable. Summary of the Invention

[0005] In view of this, an embodiment of the present invention hopes to provide a high-hardness EPDM rubber insulation for a submersible electric pump cable to solve or alleviate the technical problems existing in the prior art and at least provide a beneficial option.

[0006] To solve the above technical problems, the technical solution adopted in this application is: a high-hardness EPDM rubber insulation for a submersible electric pump cable, wherein the weight proportions of the rubber insulation components are: 100 parts of EPDM rubber, 2 parts of antioxidant RD, 2 parts of antioxidant 1010, 5 parts of zinc oxide, 5 parts of semi-reinforcing carbon black, 2 parts of silane coupling agent A172, 5 parts of white carbon black, 5 parts of polybutadiene, 10 parts of paraffin oil, 20 parts of calcined clay, 10 parts of talc, and 4 parts of DCP.

[0007] As a further description of the above technical solution: the antioxidant RD and the antioxidant 1010 work synergistically to form a composite anti-aging system.

[0008] As a further description of the above technical solution: the zinc oxide and the DCP cooperate to form a vulcanization and activation system.

[0009] As a further description of the above technical solution: the preparation process of the insulating rubber comprises the following steps:

[0010] 1) Mastication: After weighing EPDM rubber and polybutadiene according to weight, put them into an internal mixer with the mixing chamber temperature controlled at 100-110°C for 5-7 minutes; after the completion of the mastication, transfer them to an open mixer with the roller temperature controlled at 60-70°C for 3-5 thin passes, and then weigh them in batches and place them aside for use.

[0011] 2) Mixing: First, the plasticized rubber is plasticized in an internal mixer for a short time of 2-3 minutes, and then zinc oxide, silane coupling agent A172, semi-reinforcing carbon black, white carbon black, and paraffin oil are added in sequence, and mixed at a temperature of 90-95°C for 4-6 minutes to prepare a masterbatch; the masterbatch is taken out from the internal mixer and placed in an open mixer, and calcined clay and talcum powder are added at a roller temperature of 60-70°C and mixed for 3-5 minutes; the mixed rubber is then placed in the internal mixer, antioxidants RD and antioxidant 1010 are added, and mixed for 2-3 minutes, followed by the addition of DCP, and mixed at a temperature of 85-90°C for 1-2 minutes; after mixing, the rubber is thin-passed on the open mixer 3-5 times, then sheeted and cooled to room temperature.

[0012] 3) Molding and vulcanization: The mixed rubber material is formed into the desired shape through extrusion, calendering or molding; vulcanization is carried out using a flat vulcanizer at a vulcanization temperature of 170-180°C and a vulcanization pressure of 10-15 MPa. The vulcanization time is determined according to the thickness of the product, and the vulcanization time is 1-2 minutes per millimeter of thickness.

[0013] As a further description of the above technical solution: in the plasticating step, the rotor speed of the internal mixer is 40-60r / min.

[0014] As a further description of the above technical solution: in the mixing step, after adding zinc oxide, silane coupling agent A172, semi-reinforced carbon black, white carbon black, and paraffin oil, a segmented mixing process is adopted, with each segment mixing time being 1-2 minutes and the interval time between segments being 0.5-1 minute.

[0015] As a further description of the above technical solution: in the molding and vulcanization steps, when the extrusion process is used for molding, the aspect ratio of the screw of the extruder is 15-20:1, and the screw speed is 20-40r / min.

[0016] As a further description of the above technical solution: in the molding and vulcanization steps, when the molding process is adopted, the mold preheating temperature is 160-170°C and the holding time is 5-10 minutes.

[0017] The embodiment of the present invention adopts the above technical solution, which has the following advantages:

[0018] The composite anti-aging system composed of antioxidant RD and antioxidant 1010 significantly improves the aging resistance of insulating rubber and extends its service life;

[0019] The vulcanization and activation system composed of zinc oxide and DCP makes the rubber vulcanization more complete and improves the physical and mechanical properties of the product;

[0020] Silane coupling agent A172 enhances the bonding strength between rubber and inorganic fillers. Combined with semi-reinforced carbon black, white carbon black and other fillers, it improves the mechanical properties while ensuring insulation performance.

[0021] At the same time, reasonable preparation process design optimizes the parameters of each process, improves the processing performance of the insulating rubber, increases production efficiency, reduces production costs, and has good economic benefits and market application prospects. DETAILED DESCRIPTION

[0022] The following is a detailed description in conjunction with the embodiments of the present disclosure.

[0023] It should be clear that the following embodiments of the present disclosure are described through specific concrete examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other in the absence of conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0024] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on this disclosure, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0025] The specific implementation of the present invention is as follows:

[0026] The present embodiment provides a formula for high-hardness ethylene-propylene rubber insulation for submersible pump cables, and the weight proportions of the components are as follows:

[0027] 100 parts of EPDM rubber, 2 parts of antioxidant RD, 2 parts of antioxidant 1010, 5 parts of zinc oxide, 5 parts of semi-reinforcing carbon black, 2 parts of silane coupling agent A172, 5 parts of white carbon black, 5 parts of polybutadiene, 10 parts of paraffin oil, 20 parts of calcined clay, 10 parts of talc, and 4 parts of DCP.

[0028] The preparation steps are as follows:

[0029] (1) Plasticizing:

[0030] ① After weighing the EPDM rubber and polybutadiene according to the weight parts in the formula, put them into the internal mixer, control the temperature of the internal mixer at 105℃, and plasticize for 6 minutes;

[0031] ② After plasticating, transfer to the open mill, control the roller temperature of the open mill at 65℃, and perform 4 thin-pass treatments;

[0032] ③ Weigh the thinly mixed rubber according to the weight of the formula and set aside for use.

[0033] (2) Mixing:

[0034] ① Weigh the other ingredients in the formula according to the weight of the formula and set aside;

[0035] ② First, the plasticized rubber was plasticized in an internal mixer for 2 minutes, and then zinc oxide, silane coupling agent A172, semi-reinforced carbon black, white carbon black, and paraffin oil were added in sequence, and mixed at 93°C for 5 minutes to prepare a masterbatch;

[0036] ③ Take the masterbatch out of the internal mixer and put it into the open mixer. Add the calcined clay and talc at a roller temperature of 65°C and mix for 4 minutes.

[0037] ④ Then put the mixed rubber into the internal mixer, add antioxidant RD and antioxidant 1010, mix for 2 minutes, then add DCP and mix at 88℃ for 1 minute;

[0038] ⑤ After mixing, the rubber compound is thin-passed on the open mill for 4 times, then sheeted and cooled to room temperature.

[0039] (3) Molding and vulcanization:

[0040] ① The mixed rubber material is formed by extrusion process. The length-diameter ratio of the extruder screw is 18:1 and the screw speed is 30r / min;

[0041] ② Use a flat vulcanizing machine for vulcanization, the vulcanization temperature is 175℃, the vulcanization pressure is 12MPa, and the vulcanization time is determined according to the thickness of the product. The vulcanization time is 1.5 minutes for every millimeter of thickness.

[0042] In the plasticating step, the temperature of the internal mixer was controlled at 102° C., and the plasticating time was 5.5 minutes; the roller temperature of the open mixer was 63° C., and the mixture was thinly passed 3 times.

[0043] During the mixing step, after adding zinc oxide and other raw materials, the mixing temperature was 92°C for 4.5 minutes; after adding calcined clay and talc, the mixing time was 3.5 minutes; after adding the antioxidant, the mixing time was 1.8 minutes; after adding DCP, the mixing time was 1 minute. The mill was thinned three times.

[0044] During the molding and vulcanization steps, the extruder screw speed was 28 rpm, the flat plate vulcanizer vulcanization temperature was 173°C, and the vulcanization pressure was 11 MPa.

[0045] To solve the above technical problems, another technical solution adopted in this application is: a computer device, which includes a processor and a memory coupled to the processor, wherein program instructions are stored in the memory, and when the program instructions are executed by the processor, the processor executes the steps of the high-precision motion capture real-time calibration method based on multi-sensor fusion as described above.

[0046] In the present disclosure, relational terms such as first and second are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. The blocks of the devices, devices, equipment, and systems involved in the present disclosure are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the blocks. As will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "including," "comprising," "having," and the like are open words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or," and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0047] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0048] The above description has been provided for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present disclosure to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A high-hardness EPDM rubber insulation for a submersible electric pump cable, characterized in that: The weight proportions of the insulating rubber components are as follows: 100 parts of EPDM rubber, 2 parts of antioxidant RD, 2 parts of antioxidant 1010, 5 parts of zinc oxide, 5 parts of semi-reinforcing carbon black, 2 parts of silane coupling agent A172, 5 parts of white carbon black, 5 parts of polybutadiene, 10 parts of paraffin oil, 20 parts of calcined clay, 10 parts of talc, and 4 parts of DCP.

2. The high-hardness EPDM rubber insulation for submersible electric pump cable according to claim 1, characterized in that: The antioxidant RD and the antioxidant 1010 work together to form a composite anti-aging system.

3. The high-hardness EPDM rubber insulation for submersible electric pump cable according to claim 1, characterized in that: The zinc oxide and the DCP cooperate to form a vulcanization and activation system.

4. The high-hardness EPDM rubber insulation for submersible electric pump cable according to any one of claims 1 to 3, characterized in that: The preparation process of the insulating rubber comprises the following steps: 1) Mastication: After weighing EPDM rubber and polybutadiene according to weight, put them into an internal mixer with the mixing chamber temperature controlled at 100-110°C for 5-7 minutes; after the completion of the mastication, transfer them to an open mixer with the roller temperature controlled at 60-70°C for 3-5 thin passes, and then weigh them in batches and place them aside for use. 2) Mixing: First, the plasticized rubber is plasticized in an internal mixer for a short time of 2-3 minutes, and then zinc oxide, silane coupling agent A172, semi-reinforcing carbon black, white carbon black, and paraffin oil are added in sequence, and mixed at a temperature of 90-95°C for 4-6 minutes to prepare a masterbatch; the masterbatch is taken out from the internal mixer and placed in an open mixer, and calcined clay and talcum powder are added at a roller temperature of 60-70°C and mixed for 3-5 minutes; the mixed rubber is then placed in the internal mixer, antioxidants RD and antioxidant 1010 are added, and mixed for 2-3 minutes, followed by the addition of DCP, and mixed at a temperature of 85-90°C for 1-2 minutes; after mixing, the rubber is thin-passed on the open mixer 3-5 times, then sheeted and cooled to room temperature. 3) Molding and vulcanization: The mixed rubber material is formed into the desired shape through extrusion, calendering or molding; vulcanization is carried out using a flat vulcanizer at a vulcanization temperature of 170-180°C and a vulcanization pressure of 10-15 MPa. The vulcanization time is determined according to the thickness of the product, and the vulcanization time is 1-2 minutes per millimeter of thickness.

5. The process for preparing high-hardness EPDM rubber insulation for submersible pump cables according to claim 4 is characterized in that: In the plasticating step, the rotor speed of the internal mixer is 40-60 r / min.

6. The process for preparing high-hardness EPDM rubber insulation for submersible pump cables according to claim 4, characterized in that: In the mixing step, after zinc oxide, silane coupling agent A172, semi-reinforced carbon black, white carbon black and paraffin oil are added, a segmented mixing process is adopted, with each segment mixing time being 1-2 minutes and the interval time between segments being 0.5-1 minute.

7. The process for preparing high-hardness EPDM rubber insulation for submersible pump cables according to claim 4, characterized in that: In the molding and vulcanization steps, when the extrusion process is used for molding, the aspect ratio of the screw of the extruder is 15-20:1, and the screw speed is 20-40 r / min.

8. The process for preparing high-hardness EPDM rubber insulation for submersible pump cables according to claim 4 is characterized in that: In the molding and vulcanization steps, when the molding process is adopted, the mold preheating temperature is 160-170° C. and the holding time is 5-10 minutes.